Marktstraße 39, Eschwege
The ventilation slots or grills are still visible at Marktstraße 39, a two-story half-timbered former meat shop built in 1711, in Eschwege, Germany. These slots are very functional as they allow air to circulate through while preventing large objects from entering the ductwork.
Typically, ventilation slots are found above the windows, doors, or on the roof. Some slots have decorative frames or panels.

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